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</head><body><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src="https://cdn.jsdelivr.net/gh/CodingDGSun/images-db@master/Blog/头像.7horht40yvwg.jpg" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/codingdgsun/archives/"><div class="headline">Articles</div><div class="length-num">59</div></a></div></div></div><hr/></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('https://cdn.jsdelivr.net/npm/butterfly-extsrc@1/img/default.jpg')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/codingdgsun/">CodingDGSun's Blog</a></span><div id="menus"><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Java中try、catch、finally执行顺序</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">Created</span><time class="post-meta-date-created" datetime="2021-07-08T05:50:10.000Z" title="Created 2021-07-08 13:50:10">2021-07-08</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">Updated</span><time class="post-meta-date-updated" datetime="2021-07-08T05:50:25.997Z" title="Updated 2021-07-08 13:50:25">2021-07-08</time></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Java中try、catch、finally执行顺序"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">Post View:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><p><strong>try、catch和finally</strong></p>
<ul>
<li>try块：用于捕获异常。<ul>
<li>后面可以有0个或多个catch块。</li>
<li>只能有0个或1个finally块。</li>
<li>try块后面，如果没有catch块，则后面必须有一个finally块。</li>
<li>执行代码捕获异常后，进入catch块，try中出现异常代码处后面的代码不会再继续执行。</li>
</ul>
</li>
<li>catch块：用于处理处理try中捕获的异常。<ul>
<li>可以有多个catch块，进入一个catch块后，执行完毕后，如果有finally块，则进入finally块。即使后面还有catch块，也不会再进入其他catch块。</li>
</ul>
</li>
<li>finally块：无论是否捕获或处理异常，finally块中的代码都会被执行。<ul>
<li>当try块中或者catch块中遇到return语句时，先执行完finally里面的代码后，再执行return返回语句。</li>
</ul>
</li>
</ul>
<hr>
<p><strong>可以有多个catch块，并且try块后面，只能有0个或1个finally块</strong></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">public static void main(String[] args) &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">        System.out.println(&quot;try...&quot;);</span><br><span class="line">    &#125;catch (ArithmeticException e)&#123;</span><br><span class="line">        System.out.println(&quot;ArithmeticException...&quot;);</span><br><span class="line">    &#125;catch (NullPointerException e)&#123;</span><br><span class="line">        System.out.println(&quot;NullPointerException...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">    finally &#123;</span><br><span class="line">        System.out.println(&quot;finally...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">//输出结果：</span><br><span class="line">//try...</span><br><span class="line">//finally...</span><br></pre></td></tr></table></figure>

<hr>
<p><strong>try块后面，如果没有catch块，则后面必须有一个finally</strong></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">public static void main(String[] args) &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">        System.out.println(&quot;try...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">    finally &#123;</span><br><span class="line">        System.out.println(&quot;finally...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">//输出结果：</span><br><span class="line">//try...</span><br><span class="line">//finally...</span><br></pre></td></tr></table></figure>

<hr>
<p><strong>执行代码捕获异常后，进入catch块，try中出现异常代码处后面的代码不会再继续执行</strong></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">public static void main(String[] args) &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">        System.out.println(&quot;try...&quot;);</span><br><span class="line">        int a = 0;</span><br><span class="line">        String str = null;</span><br><span class="line">        System.out.println(str.toString());</span><br><span class="line">        a = a / 0;</span><br><span class="line">    &#125; catch (ArithmeticException e) &#123;</span><br><span class="line">        System.out.println(&quot;ArithmeticException...&quot;);</span><br><span class="line">    &#125; catch (NullPointerException e) &#123;</span><br><span class="line">        System.out.println(&quot;NullPointerException...&quot;);</span><br><span class="line">    &#125; finally &#123;</span><br><span class="line">        System.out.println(&quot;finally...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">//输出结果：</span><br><span class="line">//try...</span><br><span class="line">//NullPointerException...</span><br><span class="line">//finally...</span><br></pre></td></tr></table></figure>

<hr>
<p><strong>当try块中或者catch块中遇到return语句时，先执行完finally里面的代码后，再执行return返回语句。</strong></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">public static void main(String[] args) &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">        System.out.println(&quot;try...&quot;);</span><br><span class="line">        return;</span><br><span class="line">    &#125; catch (ArithmeticException e) &#123;</span><br><span class="line">        System.out.println(&quot;ArithmeticException...&quot;);</span><br><span class="line">    &#125; catch (NullPointerException e) &#123;</span><br><span class="line">        System.out.println(&quot;NullPointerException...&quot;);</span><br><span class="line">    &#125; finally &#123;</span><br><span class="line">        System.out.println(&quot;finally...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">//输出结果：</span><br><span class="line">//try...</span><br><span class="line">//finally...</span><br></pre></td></tr></table></figure>

<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">public static void main(String[] args) &#123;</span><br><span class="line">    try &#123;</span><br><span class="line">        System.out.println(&quot;try...&quot;);</span><br><span class="line">        int a = 0;</span><br><span class="line">        a = a / 0;</span><br><span class="line">    &#125; catch (ArithmeticException e) &#123;</span><br><span class="line">        System.out.println(&quot;ArithmeticException...&quot;);</span><br><span class="line">        return;</span><br><span class="line">    &#125; catch (NullPointerException e) &#123;</span><br><span class="line">        System.out.println(&quot;NullPointerException...&quot;);</span><br><span class="line">    &#125; finally &#123;</span><br><span class="line">        System.out.println(&quot;finally...&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">//输出结果：</span><br><span class="line">//try...</span><br><span class="line">//ArithmeticException...</span><br><span class="line">//finally...</span><br></pre></td></tr></table></figure>
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